html,
body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}

#viewport {
  position: relative;
  width: 100%;
  height: 100%;
  background-color: white;
  overflow: hidden;
}

#canvas {
  position: absolute;
}

.node {
  position: absolute;
  border: 1px solid gray;
  background-color: bisque;
}
